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Biohacking · Answer

What is NAD+ and does it decline with age?

NAD+ is a coenzyme central to energy metabolism, and levels appear to fall with age. Here's what research shows about NAD+ precursors in humans.
By Reviewed Updated 1 min read

Quick answer

What is NAD+ and does it decline with age?

NAD+ (nicotinamide adenine dinucleotide) is a coenzyme found in every cell, essential for converting food into energy and for DNA repair enzymes. Research suggests NAD+ levels decline with age in several tissues. Precursors like nicotinamide riboside can raise NAD+ in humans, but clear benefits for aging in people have not yet been shown.

At a glance

Key takeaways

  • NAD+ is essential for energy metabolism and many repair enzymes.
  • Levels appear to decline with age in several tissues.
  • Precursors such as NR and NMN raise blood NAD+ in human studies.
  • Human trials haven't yet shown meaningful anti-aging outcomes.

NAD+ is one of the hottest topics in longevity science. Here's what's known, and what remains hype.

What NAD+ does

Nicotinamide adenine dinucleotide is a coenzyme present in every living cell. It has two major jobs:

  • Energy metabolism: it shuttles electrons in the reactions that turn food into usable energy.
  • Enzyme fuel: it's consumed by enzymes such as sirtuins and PARPs, which are involved in DNA repair and cellular stress responses.

Does it decline with age?

A 2015 review in Science summarized evidence that NAD+ levels decline with age in multiple tissues in animals and humans, and that this decline may contribute to several age-related changes. Raising NAD+ improved several markers of health in animal models, which sparked the current wave of interest.

What human studies show

A 2018 randomized crossover trial in healthy middle-aged and older adults found that nicotinamide riboside (NR) at 1,000 mg a day for six weeks was well tolerated and raised NAD+ levels in blood cells. There were hints of improvements in blood pressure and arterial stiffness in some participants, but the study was small and not designed to prove those effects.

Since then, trials of NR and NMN have generally confirmed they raise NAD+ in the blood, while effects on meaningful outcomes remain modest or unclear.

The bottom line

NAD+ biology is real and important. Whether taking precursors slows aging in humans is not yet established. Exercise, sleep, and a nutrient-rich diet support healthy metabolism with far stronger evidence. If you're curious about supplements, discuss them with a clinician.

Learn more in our cellular health guide, and read does intermittent fasting slow aging for another popular strategy.

People also ask

More questions people ask

What is the difference between NMN and NR?

Both are NAD+ precursors that the body converts into NAD+. They follow slightly different pathways; neither has proven superior outcomes in humans.

Can you boost NAD+ naturally?

Exercise, adequate niacin (vitamin B3) intake and healthy sleep patterns are linked to NAD+ metabolism.

Are NAD+ supplements safe?

Short-term studies suggest they're generally well tolerated, but long-term safety data in humans is limited.

Answers

More answers

Citations

Sources & references

  1. [1]NAD+ in aging, metabolism, and neurodegenerationVerdin E. Science, 2015 · ReviewView source : NAD+ in aging, metabolism, and neurodegeneration (opens in a new tab)
  2. [2]Chronic nicotinamide riboside supplementation is well-tolerated and elevates NAD+ in healthy middle-aged and older adultsMartens CR, Denman BA, Mazzo MR, et al.. Nature Communications, 2018 · Randomized trialView source : Chronic nicotinamide riboside supplementation is well-tolerated and elevates NAD+ in healthy middle-aged and older adults (opens in a new tab)

Study links open a PubMed search for the exact title, so they keep working even if a journal changes its URL.

Related guides

Go deeper

Longevity · GuideCellular Health: Mitochondria, NAD+, Autophagy and Aging CellsWhat is cellular health? A clear guide to mitochondria, NAD+, autophagy, oxidative stress and senescent cells — and the evidence-based ways to support healthy cells as you age.Longevity · GlossaryNAD+: definitionNAD+ (nicotinamide adenine dinucleotide) is a coenzyme found in every cell that is essential for energy metabolism, DNA repair and the activity of sirtuin enzymes.Longevity · AnswerDoes Intermittent Fasting Slow Aging? What the Research ShowsIntermittent fasting shows intriguing aging effects in animals, but human trials mostly find benefits similar to calorie cutting. Here's the evidence.Biohacking · HubBiohacking: Evidence-Informed Tools to Optimize Your BiologyAn evidence-rated guide to biohacking: sleep, light, red light therapy, cold and heat, wearables, hyperbaric oxygen, PEMF and how to run safe personal experiments.Biohacking · GuideCold Exposure: Cold Plunges, Cold Showers and What the Science ShowsWhat cold plunges and cold showers actually do: alertness, mood, brown fat, soreness, training trade-offs, beginner protocols and important safety precautions.Biohacking · ArticleCold Plunge for Beginners: Temperature, Timing and SafetyA safe, step-by-step intro to cold plunging: starting temperatures and times, breathing through cold shock, training timing and who needs clearance.

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